Preheat your oven to 350°F (175°C). Grease a 9.25 x 5.25-inch loaf pan and consider lining the bottom with parchment paper.

In a large mixing bowl, cream the softened butter and granulated sugar until light and fluffy, about 3-4 minutes.

Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract and mashed sweet potatoes until blended.

In a separate bowl, whisk together flour, baking soda, salt, cinnamon, and nutmeg. Gradually add this to the wet ingredients until just blended.

Pour the batter into the prepared loaf pan and smooth the top with a spatula.

In a small bowl, mix sugar and cinnamon for the topping. Sprinkle it evenly over the batter.

Bake for 55-65 minutes, checking for doneness with a toothpick. Cover with foil if the top browns too quickly.

Allow the bread to cool in the pan for about 15 minutes before transferring to a cooling rack.